only perform multi-root mapping if there are multiple roots (#28352)

0d6bb6ae · Jonah Williams · GitHub · 7baffa6e · 0d6bb6ae
Unverified Commit 0d6bb6ae authored Feb 23, 2019 by Jonah Williams Committed by GitHub Feb 23, 2019
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compile.dart packages/flutter_tools/lib/src/compile.dart +5 -1

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--- a/packages/flutter_tools/lib/src/compile.dart
+++ b/packages/flutter_tools/lib/src/compile.dart
@@ -117,7 +117,11 @@ class PackageUriMapper {

    for (String packageName in packageMap.keys) {
      final String prefix = packageMap[packageName].toString();
-      if (fileSystemScheme != null && fileSystemRoots != null && prefix.contains(fileSystemScheme)) {
+      // Only perform a multi-root mapping if there are multiple roots.
+      if (fileSystemScheme != null
+        && fileSystemRoots != null
+        && fileSystemRoots.length > 1
+        && prefix.contains(fileSystemScheme)) {
        _packageName = packageName;
        _uriPrefixes = fileSystemRoots
          .map((String name) => Uri.file(name, windows: platform.isWindows).toString())